13. Demodulator Adjustment

Assembly Adjusted

A4 Log Amplifier Assembly

Related Performance Test

There is no related performance test for this adjustment procedure.

Description

A 5 kHz peak-deviation FM signal is applied to the INPUT 5Ofl. The detected audio is monitored by an oscilloscope. FM DEMOD is adjusted to peak the response displayed on the oscilloscope.

OSCILLOSCOPE

wj

S I G N A L G E N E R A T O R

I O U T P U T

ADAPTERADAPTER

S K 1 1 5

Figure 2-16. Demodulator Adjustment Setup

Equipment

AM/FM Signal Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 8640B Oscilloscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP 1980A/B

Adapters

Type N (m) to BNC (f) (2 required) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1250-1476

2-52 Adjustment Procedures